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Per that link, this runs a Linux kernel as a VM on top of an L4-based hypervisor.
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I mean something like MkLinux with seL4 at its core with all processes and drivers running under seL4 and taking advantage of the seL4 capability model.

It doesn't even have to be a Linux–compatible OS in theory although that is the standard to beat.

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But running Linux on top of seL4 does not take advantage of the capability model at all. You need a new non-unix-like userspace for that.
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